1. 6" long shaft design, especially suitable for bolt tightening operations in pipe pile factories. 2. The structure of the pinless percussion cylinder, with large torque and longer service life 3. Plastic steel handle, not easy to break 4. The forward and reverse three gears reverse and adjust the speed to meet different torque requirements 5. Ultra-light weight, ultra-large torque 6. 15° inclined joints, the air pipe will not get in the way 7. Bird-shaped trigger for more comfortable control (inner trigger is also available)